WINNEBAGO MICRO MINNIE 1700BH – Furnace Igniter Replacement

Knowing how to diagnose and repair RV systems isn’t just a maintenance skill — it’s a negotiation weapon when you’re buying. Every mechanical issue I can identify on a walkthrough is money off the asking price. Most sellers don’t know what’s wrong with their own rig, which means an informed buyer has all the leverage. The furnace igniter is one of those components I check on every walkthrough — it’s a small part that fails quietly, leaves the rig cold and unusable, and sends most owners straight to a dealer for a service estimate that scares them into selling cheap. On the Winnebago Micro Minnie 1700BH specifically, I’ve seen this failure misdiagnosed as a propane issue, a thermostat problem, or worse — a full furnace replacement — when nine times out of ten it’s a worn igniter that costs a fraction of what a shop will charge you, and this guide will show you exactly how to handle it yourself.

The Control Board That Actually Survives a Micro Minnie’s Tight Engine Bay

The Suburban SF furnace ignition circuit board fails silently—no spark, no ignition, no heat—and most owners mistake it for a dead furnace until they’re already shivering or, worse, trying to resell. The Lrichy OEM 520820 is the exact replacement that handles the 12VDC control logic without the cross-compatibility guessing game that kills half the cheap knockoffs in your shopping cart.

What works

• Drops directly into the existing harness with zero rewiring—the connector and pin layout match OEM spec, which means no voltage drop surprises once you button it up.
• Furnace fires on first attempt after installation; you’ll hear the igniter click immediately when you toggle the thermostat, not the dead silence that makes you wonder if you bought the wrong part.
• Holds voltage stable under load, so the igniter electrode doesn’t go weak mid-winter—the board doesn’t degrade after three months like the $30 Amazon gambles.

What doesn’t

• Ship speed is unpredictable; I’ve seen 2-day delivery and 3-week waits from the same seller, which matters when someone’s already without heat.
• Doesn’t repair a failed sail switch or bad electrode—if the board was only half your problem, you’ll still have a furnace that won’t hold flame once it sparks.

I second-guessed myself once after swapping the board and the furnace still wouldn’t ignite—turned out the electrode gap was corroded, not the board itself—but ordering the right OEM part eliminated one variable and actually let me diagnose the real failure. Lrichy OEM 520820 RV Furnace Ignition Circuit Board for Suburban SA/SF/SFV/SH/NT Furnaces, 12VDC Control Module for SF 20/25/30/35/42, NT 12/16/20/24/30/34, 521099 520741 520871

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